摘要
长白向斜位于吉林省长白县,属于太子河—浑江台陷的南翼鸭绿江凹陷的一部分,隔鸭绿江上游断裂与朝鲜的狼林地块相连,北翼则隔逆掩断裂直接与老岭背斜的元古代地层相接,东西两端进入朝鲜分别与惠山—利原凹陷和鸭绿江凹陷容为一体。
The Changbai syncline belongs to part of the southern margin of the Taizihe-Hunjiang downwarpping. In recent years,as the Shibadaogou,the Shisandaogou and the Jinkengling coal mines (occurrences) have been found successively with a thorough investigation and study in the geological work,it has become a new and im- portant coal field in Jilin province. After researching the sedimentary formation,succession,characteristics of orebodies,analysis of grain size,directional measurement and lithological correlation,the author holds that the Shisandaogou was the depressing center of the Changbai syncline in the late Palaeozoic epoch and that the syncline had high relief at two ends.In the Mid-Carboniferous,Benxi Formation,as the immersion occurred,coal-forming environments were not favourable,be- longing to littoral lagoon environment with the narrow passage and uneven flow.In the late Carboniferous,sea water had receded generally,the fluviatile action was dominant.The delta environment with formation materials derived from the southern old land,which moved continually into the deep part of trough,provides a favourable condition for coal-forming process in this ar- ea.The distributary estuaries and the front of sand bodies of the delta were the places where the thick coal-bed occurred.The author believes that the above analysis will play an important guiding role in prospecting for ore de- posits.
出处
《吉林地质》
1989年第3期10-24,35,共15页
Jilin Geology
